Efficient and selective capture of thorium ions by a covalent organic framework

作者：Xiaojuan Liu, Feng Gao, Tiantian Jin, Ke Ma, Haijiang Shi, Ming Wang, Yanan Gao, Wenjuan Xue, Jing Zhao, Songtao Xiao, Yinggen Ouyang, Ye Guoan · 发表于：Nature Communications · 年份：2023 · DOI：10.1038/s41467-023-40704-0 · 被引用次数：155 · 研究领域：Covalent Organic Framework Applications、Radioactive element chemistry and processing、Metal-Organic Frameworks: Synthesis and Applications

Abstract The selective separation of thorium from rare earth elements and uranium is a critical part of the development and application of thorium nuclear energy in the future. To better understand the role of different N sites on the selective capture of Th(IV), we design an ionic COF named Py-TFImI-25 COF and its deionization analog named Py-TFIm-25 COF, both of which exhibit record-high separation factors ranging from 102to 105. Py-TFIm-25 COF exhibits a significantly higher Th(IV) uptake capacity and adsorption rate than Py-TFImI-25 COF, which also outperforms the majority of previously reported adsorbents. The selective capture of Py-TFImI-25 COF and Py-TFIm-25 COF on thorium is via Th-N coordination interaction. The prioritization of Th(IV) binding at different N sites and the mechanism of selective coordination are then investigated. This work provides an in-depth insight into the relationship between structure and performance, which can provide positive feedback on the design of novel adsorbents for this field.